<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        /*块级元素，行内元素 ，行内块元素*/
        a {
            /* display: none | block| inline | inline-block;*/
            /*opacity: e;*/
            text-decoration: none;
        }

        input {
            outline: none;
        }

        ul {
            margin: 0;
            padding: 0;
            list-style: none;
        }
    </style>
</head>

<body>
    <a href="">测试链接</a>

    <input type="text">

    <span>测试行内元素宽高</span>

    <img src="./image/icon.png" alt="">

    <ul>
        <li></li>
        <li></li>
        <li></li>
    </ul>
</body>

</html>